<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../react18/react.development.js"></script>
    <script src="../react18/react-dom.development.js"></script>
    <script src="../react18/babel.min.js"></script>
</head>

<body>
    <div id="app"></div>
    <script type="text/babel">

        /*
            props是用来做组件通信的
              -在父组件中使用子组件时,可以给子组件添加属性
              -在子组件中组件实例的props属性就可以保存这个属性和值
        */

        class Parent extends React.Component{
            state = {
                car:"五菱宏光mini"
            }

            render(){
                const {car} = this.state
                return (
                    <div>
                        <h1>我是父组件</h1>
                        <p>我开的车是{car}</p>
                        <button onClick={this.changeCarHandle}>股票涨停了,换一辆车</button>
                        <hr />
                        <Child a={1} car={car} />
                    </div>
                )
            }

            changeCarHandle = ()=> {
                this.setState({car:"奥迪RS7"})
            }

        }

        function Child(props){
            const {car} = props
            return (
                <p>我是儿子组件,我开我爹的车{car}</p>
            )
        }

        const root = ReactDOM.createRoot(document.getElementById("app"))
        root.render(<Parent />)
    </script>
</body>

</html>